CN220665136U - System for strengthening methane conversion and membrane pollution resistance of sludge by combining carbon points with membrane - Google Patents
System for strengthening methane conversion and membrane pollution resistance of sludge by combining carbon points with membrane Download PDFInfo
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The utility model discloses a system for strengthening methane conversion and membrane pollution resistance of sludge by combining carbon points with an electric membrane, which is characterized in that the methane conversion of the sludge is strengthened and the membrane pollution resistance of an anaerobic membrane reactor is enhanced by introducing carbon points and combining a bioelectrical coupling anaerobic membrane bioreactor on the basis of the anaerobic membrane bioreactor. The system consists of a carbon point supply device, a bioelectric supply device and a membrane bioreactor, and is characterized in that bioelectric is directly supplied to a membrane component of the membrane bioreactor, and the bioelectric is utilized to promote enrichment of carbon points and microorganisms in the membrane component so as to promote bioconversion. Compared with the prior device, the system has the advantages of obviously enhancing the methane conversion efficiency, relieving the membrane pollution, promoting the organic matter hydrolysis process, enhancing the microorganism population diversity and the synergistic effect, and the like, well solves the problems of low methane conversion rate of sludge and serious membrane pollution, has simple flow, low price and wide industrial application prospect.
Description
Technical Field
The utility model relates to the technical field of organic solid waste anaerobic membrane biological energy conversion treatment and bioelectrochemistry, in particular to a system for strengthening sludge methane conversion and membrane pollution resistance by combining carbon points with an electric membrane.
Background
The efficient conversion and recycling of organic solid wastes are important means for solving the problems of global environmental pollution, energy shortage and resource deficiency. Anaerobic fermentation has the characteristics of concentration, high efficiency, environmental friendliness and energy regeneration, and is an important implementation means for realizing recycling and harmless disposal of solid wastes. The wastewater sludge and the kitchen waste are important components of organic solid waste, and the wastewater sludge and the kitchen waste are subjected to anaerobic co-digestion in a synergistic way, so that the defect of single-matrix fermentation can be overcome, the C/N ratio is better balanced, the system stability is promoted, and the method is a treatment mode with potential. However, in practical application, anaerobic fermentation often has the defects of long stay period, complex operation, unstable digestion performance and the like, so that improvement and optimization of the existing anaerobic fermentation process are needed.
Anaerobic membrane bioreactors (AnMBRs) are emerging means of devices in anaerobic treatment processes, which achieve complete separation of hydraulic residence time from solid residence time by virtue of the entrapment of macromolecular substances by the fine pore size of their membrane materials. Compared with the traditional anaerobic process, the anaerobic membrane bioreactor has the advantages of stable fermentation process, lower energy consumption, improved treatment effect and the like. However, the anaerobic membrane bioreactor is generally applied to the treatment of high-concentration organic wastewater, the starting time of the treatment of organic solid waste is still longer, and the operation cost is higher. In addition, the low methane conversion under single strategy regulation is also a key factor limiting the further development of the methane conversion. Therefore, to save costs, increase the efficiency and profits of the process, multi-strategy regulation needs to be introduced.
Chinese patent (patent publication No. CN207537216U, publication No. 2018.06.26) proposes a membrane bioreactor separated by baffle plates, which can form concentration gradients of sludge and organic matters in each compartment by prolonging the reaction flow, reduce the concentration of the sludge mixed liquor which is finally contacted with a membrane component, improve the efficiency of anaerobic reaction and reduce the running membrane washing cost. The defects are that the occupied area of the reactor is large, the folded plate structure is complex to manufacture, and the cost is high.
The Chinese patent (pretreatment-EGSB-microorganism electrochemical combined device and method for degrading excess sludge) (grant publication No. CN 105541059B, grant publication No. 2017.10.24) proposes a sludge treatment process of microorganism electrochemical coupling expansion granular sludge bed, and the sludge is subjected to anaerobic digestion and crushing to form high-concentration organic wastewater containing solid particles; the high-concentration organic wastewater is degraded by the EGSB anaerobic granular sludge and is further treated by a microbial electrochemical system, so that the wastewater is discharged after reaching the standard. The method has the defects that the EGSB has long starting time and the granular sludge is difficult to culture; microbial electrochemistry acts only on the aqueous phase, and has limited promotion effect on microorganisms; biogas production lacks data support and is not suitable for commercial use.
The Chinese patent (a method for improving anaerobic fermentation gas production by using carbon quantum dots as an accelerant) (grant publication No. CN 107604011B, grant publication No. 2020.07.31) proposes a method for preparing the carbon quantum dots by using sodium citrate aqueous solution and ethylenediamine as raw materials, wherein the total methane yield is improved by 14.8% compared with a control group under the condition of 1.0g/L of addition amount. The method has the defects that the yield of methane after adding the carbon quantum dots is limited, and when the adding amount is 0.1g/L, the total yield of methane tends to be reduced, and the practicability is deficient.
The Chinese patent (an integrated membrane bioreactor for resisting membrane pollution) (grant bulletin No. CN203807301U, grant bulletin day 2014.09.03) proposes an integrated membrane bioreactor for resisting membrane pollution, wherein the membrane pollution is controlled by arranging a power and control area, a high-efficiency pretreatment area and a membrane biological treatment area. The method is provided with a polypropylene semi-soft spherical stuffing box, transfers microorganisms and membrane pollutants to the stuffing, integrates an ultrasonic cleaning device and keeps the membrane surface clean. The disadvantage is that the reactor is complex to maintain and requires a high energy.
In conclusion, the prior art device has the defects of complex process structure, high maintenance difficulty, limited treatment effect, higher investment and operation cost and difficult large-scale application.
Disclosure of Invention
The utility model discloses a system for strengthening methane conversion and membrane pollution resistance of sludge by combining carbon points with an electric membrane, which is characterized in that the methane conversion of the sludge is strengthened and the membrane pollution resistance of an anaerobic membrane reactor is enhanced by introducing carbon points and combining a bioelectrical coupling anaerobic membrane bioreactor on the basis of the anaerobic membrane bioreactor. The system consists of a carbon point supply device, a bioelectric supply device and a membrane bioreactor, and is characterized in that bioelectric is directly supplied to a membrane component of the membrane bioreactor, and the bioelectric is utilized to promote enrichment of carbon points and microorganisms in the membrane component so as to promote bioconversion. Compared with the prior device, the system has the advantages of obviously enhancing the methane conversion efficiency, relieving the membrane pollution, promoting the organic matter hydrolysis process, enhancing the microorganism population diversity and the synergistic effect, and the like, well solves the problems of low methane conversion rate of sludge and serious membrane pollution, has simple flow, low price and wide industrial application prospect.
The specific technical scheme for realizing the aim of the utility model is as follows:
the system is characterized by comprising a carbon point supply device, a bioelectricity supply device and a membrane bioreactor, wherein the carbon point supply device comprises a carbon point storage tank and a carbon point feeder, and the carbon point storage tank is connected with the carbon point feeder through a pipeline;
the bioelectric power supply device is a three-phase potential constant instrument with preset potential;
the membrane bioreactor comprises a shell, a composite membrane component, a constant-temperature water bath, a biogas internal circulator, a carbon point feeding port, a matrix sample taking port, a gas passage port, a cathode and anode electrode, a sludge peristaltic pump, a sludge inlet, a top water outlet, a pressure sensor, a water peristaltic pump and a wet gas flowmeter, wherein the composite membrane component is arranged in the shell, two connectors are respectively arranged on the two outer sides of the shell, one side of the connector is connected with the constant-temperature water bath, the other side of the connector is connected with the biogas internal circulator, and the carbon point feeding port, the matrix sample taking port, the gas passage port, the cathode and anode electrode and the top water outlet are all arranged at the top of the shell; the composite membrane component comprises a flat membrane and a membrane-hanging electrode, wherein the membrane-hanging electrode is connected with one end of the cathode and the anode through a titanium wire; the carbon point adding port is connected with the carbon point adding device through a pipeline; the gas passage port is connected with a wet gas flowmeter; the other end of the cathode and anode is connected with the three-phase potential constant instrument; the mud inlet is arranged on one side of the shell and connected with the mud peristaltic pump through a pipeline, and is used for feeding the substrate into the shell for anaerobic treatment; the top water outlet is connected with the water outlet peristaltic pump through a pipeline and is used for discharging the treated clarified water; the pressure sensor is arranged on a top water outlet of the shell and a middle pipeline of the water outlet peristaltic pump and is used for monitoring the change of the transmembrane pressure difference of the composite membrane assembly so as to represent the membrane pollution condition.
Carbon dots added by the carbon dot adding port can be adsorbed on a composite membrane assembly comprising a flat membrane and a membrane hanging electrode to form a multilayer membrane structure, so that the conductive layer is thickened.
The carbon dots added by the carbon dot adding port are prepared by citric acid pyrolysis.
Compared with the prior art, the utility model has the following advantages and effects:
1) The reaction matrix has reasonable and better proportion, is different from single-component digestion, uses kitchen waste to condition the wastewater and sludge, and overcomes the defects of traditional wastewater and sludge fermentation by balancing the C/N ratio, enhancing the buffer capacity of the system, accelerating the hydrolysis speed and improving the system stability, thereby improving the methane recovery efficiency.
2) The process is advanced and simple, the strengthening strategy uses carbon point coupling bioelectricity synergy, and mainly comprises substrate proportioning pretreatment, medicament adding, bioelectrochemical treatment and membrane biological continuous reaction, so that the reaction time is shortened, the process is simple, the requirements on operators are simple, the medicament adding cost is low, the environment is friendly, the method is suitable for different treatment requirements, meanwhile, the occupied area is small, the equipment material cost and the labor cost are saved, and the energy economic benefit is high.
3) The energy conversion efficiency of the technology is improved, the system promotes the synergistic action of microorganisms of a system by using carbon dots, microorganism electrochemical technology and an anaerobic membrane bioreactor, so that the treatment load of organic matters is reduced, the digestion rate of the organic matters (such as polysaccharide, protein, COD and the like) is improved, the methane conversion is synchronously enhanced, and the efficiency is improved by about 102.55 percent compared with that of common treatment.
4) The technology is used for effectively relieving membrane pollution, the system applies an electric field to provide electrostatic repulsive force and electrochemical oxidation by a microbial electrochemical technology and a mode of adding carbon points, the carbon points act as electron transfer media, the decomposition of organic matters is promoted, and in-situ membrane pollution prevention and control is realized.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a membrane bioreactor composite membrane module according to the present utility model.
Detailed Description
The present utility model will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the utility model consists of a carbon point supply device, a bioelectric supply device and a membrane bioreactor, wherein the carbon point supply device comprises a carbon point storage tank 1 and a carbon point feeder 2; the bioelectric power supply device is a three-phase potential constant instrument 3 with preset potential; the center of the inside of the membrane bioreactor shell 4 is provided with a composite membrane component 5, and two sides of the membrane bioreactor shell are respectively provided with two device connectors which are connected with a constant-temperature water bath 6 and a biogas internal circulator 7; the top of the membrane bioreactor is provided with a carbon point feeding port 8, a matrix sample taking port 9, a gas passage port 10, a wet gas flowmeter 22, a cathode and anode electrode 11 and a top water outlet 19; the composite membrane component 5 comprises a flat membrane and a membrane electrode, and the flat membrane and the membrane electrode are connected with a cathode and an anode 11 at the top of the reactor through titanium wires 12; the carbon point feeding port 8 is connected with the carbon point feeding device through a pipeline; the gas passage port 10 is connected with a wet gas flowmeter 22 through a pipeline; the cathode and anode 11 is connected with the three-phase potential constancy apparatus 3 through wires; the sludge peristaltic pump 17 is connected with a sludge inlet 18 on the side surface of the membrane bioreactor shell 4 through a pipeline and is used for feeding a substrate into the membrane bioreactor shell 4 for anaerobic treatment; the top water outlet 19 is connected with a water outlet peristaltic pump 21 through a pipeline and is used for discharging the treated clarified water; the pressure sensor 20 is arranged on the middle pipeline of the top water outlet 19 and the water outlet peristaltic pump 21 of the membrane bioreactor shell 4 and is used for monitoring the change of the transmembrane pressure difference of the composite membrane assembly 5 so as to represent the membrane pollution condition.
Referring to fig. 2, the composite membrane module 5 used in the present utility model is a polyvinylidene fluoride flat membrane 13 having a membrane pore size of 0.2 μm and an effective filtration area of 0.116m 2 . The two sides of the anaerobic membrane bioreactor are provided with combined membrane hanging electrodes formed by a high-conductivity carbon felt 14 and an iridium-plated titanium net 15, the distance between the combined membrane hanging electrodes and a membrane assembly is about 10mm, and the inner membrane assembly is fixed at the inner bottom of the anaerobic membrane bioreactor by using a fixed baffle 16.
The carbon dots in the carbon dot storage tank 1 are carbon quantum dots, have characteristics similar to those of carbon nanotubes and graphene, but have more excellent electrical and optical properties compared with other carbon materials, and have the advantages of low toxicity, stable chemical properties, excellent catalytic properties and the like.
The highly conductive carbon felt 14 is used for adhesion and growth of microorganisms to form a structure similar to an electroactive biomembrane, enriches diversity of microorganism population, rapidly stabilizes the internal anaerobic microorganism metabolism environment, and has good electronic conductivity.
The iridium-plated titanium mesh 15 can promote the dissolution of the extracellular polymer of the organic matter under the electrochemical action, so that the conversion rate of the reaction matrix is improved, meanwhile, the microbial activity can be stimulated through micro-current regulation and control, the diversity of biological population is enriched, the running stability is ensured, and the methane conversion of the system and the pollution relief of an in-situ membrane are enhanced.
The utility model works as follows:
in the sludge treatment process, the wastewater sludge formed by mixing the wastewater sludge, the kitchen waste and the inoculated sludge according to the volatile solid content ratio of 1:1:1 is taken as a matrix of an anaerobic fermentation process, the pH value is respectively regulated to 7.0+/-0.1 by 1.0mol/LHCl or 1.0mol/L NaOH after the uniform mixing, the C/N ratio is balanced through the reasonable proportion of the matrix, the system buffer capacity is enhanced, the hydrolysis speed is accelerated, and the system stability is improved, so that the defect of traditional wastewater sludge fermentation is overcome, and the methane recovery efficiency is improved. The evenly mixed proportioned matrix is sent into the anaerobic membrane bioreactor shell 4 from a sludge inlet 18 through a sludge peristaltic pump 17 for anaerobic treatment, carbon points with a certain volume concentration of 1.0g/L are added from a carbon point adding port 8 through a carbon point adding device 2 from a carbon point storage tank 1, and the final effective working volume is achieved through supplementing tap water. High-purity nitrogen is introduced into a gas passage port 10 at the top of the anaerobic membrane bioreactor shell 4 for 30min to ensure anaerobic environment, the water temperature is set to be 37 ℃ by connecting a connecting port arranged on one side of the shell 4 with a constant-temperature water bath 6, and the water temperature is connected with a biogas inner circulator 7 by connecting a connecting port on the other side of the shell 4, so that the flow speed is increased by intermittent aeration and the in-situ membrane pollution is slowed down. The composite membrane component 5 in the anaerobic membrane bioreactor comprises a flat membrane and a membrane-hanging electrode, wherein the membrane-hanging electrode is connected with one end of a cathode and anode electrode 11 through a titanium wire 12, and the other end of the cathode and anode electrode 11 is connected with a three-phase potential constant instrument 3 with preset voltage of 0.8V-1.2V. The anode in the cathode and anode 11 can convert complex substrates into metabolites available to electroactive microorganisms, which makes the whole process thermodynamically favorable, thereby improving methane recovery. In addition, acetate remaining during anaerobic treatment can be further decomposed into hydrogen ions and carbon dioxide through anodic oxidation, electrons are released at the same time, and then transferred to a cathode in the cathode-anode 11 through an external circuit, and electroactive microorganisms on the cathode can directly convert carbon dioxide into methane by utilizing electrons, so that additional conversion of methane is promoted. In addition, compared with other carbon materials, the carbon dots have the characteristics of single bodies on a microscopic level, and have larger specific surface area than carbon felts or carbon cloths, so that the method is more beneficial to providing an attached surface for cells and promoting efficient inter-species electron transfer. Meanwhile, the carbon dots have excellent conductivity, and can be adsorbed on a composite membrane assembly comprising a flat membrane and a membrane electrode to form a multi-layer membrane structure, so that the conductive layer is thickened, the electron transfer rate and the methane production efficiency between microorganisms are improved, and the energy conservation and emission reduction synergistic effect is realized.
The treated clarified effluent is discharged from the pipeline through a water outlet 19 at the top of the shell 4 and an effluent peristaltic pump 21, and the pressure sensor 20 arranged on the pipeline between the water outlet 19 at the top of the shell 4 and the effluent peristaltic pump 21 is used for monitoring the change of the transmembrane pressure difference of the composite membrane assembly 5 so as to represent the membrane pollution condition; a wet gas flow meter 22 is used in connection with the gas passage port 10 to monitor the gas flow; the evenly mixed solution in a small quantity of reactors is regularly extracted through a matrix sample taking hole 9, filtered and deslagged by a microporous membrane with the thickness of 0.45 mu m, and reserved sample is stored at a low temperature and used for measuring indexes such as VFA, SCOD, PN, PS and the like so as to represent the degradation condition of organic matters. The method has the advantages that by means of microorganism electrochemistry application and carbon point addition, an electric field is applied to provide electrostatic repulsive force and electrochemical oxidation, the carbon point serves as an electron transfer medium, the decomposition of organic matters is promoted, the rising rate of the membrane permeation pressure difference in the operation process is slow, and therefore in-situ membrane pollution prevention and control is achieved, and the membrane pollution condition in the anaerobic treatment process is relieved.
Claims (3)
1. The system is characterized by comprising a carbon point supply device, a bioelectricity supply device and a membrane bioreactor, wherein the carbon point supply device comprises a carbon point storage tank (1) and a carbon point feeder (2), and the carbon point storage tank (1) is connected with the carbon point feeder (2) through a pipeline;
the bioelectric power supply device is a three-phase potential constant instrument (3) with preset potential;
the membrane bioreactor comprises a shell (4), a composite membrane component (5), a constant-temperature water bath device (6), a biogas internal circulator (7), a carbon point feeding port (8), a matrix sample taking port (9), a gas passage port (10), a cathode and anode electrode (11), a sludge peristaltic pump (17), a sludge inlet (18), a top water outlet (19), a pressure sensor (20), a water outlet peristaltic pump (21) and a wet gas flowmeter (22), wherein the composite membrane component (5) is arranged in the shell (4), two connectors are respectively arranged at two outer sides of the shell (4), one side of the connectors are connected with the constant-temperature water bath device (6), and the other side of the connectors are connected with the biogas internal circulator (7); the carbon point feeding port (8), the matrix sample taking port (9), the gas passage port (10), the cathode and anode (11) and the top water outlet (19) are all arranged at the top of the shell (4); the composite membrane component (5) comprises a flat membrane and a membrane-hanging electrode, and the membrane-hanging electrode is connected with one end of the cathode and anode electrode (11) through a titanium wire (12); the carbon point adding port (8) is connected with the carbon point adding device (2) through a pipeline; the gas passage port (10) is connected with a wet gas flowmeter (22); the other end of the cathode and anode electrode (11) is connected with the three-phase potential constant instrument (3); the mud inlet (18) is arranged at one side of the shell (4) and is connected with the sludge peristaltic pump (17) through a pipeline, and is used for feeding the substrate into the shell (4) for anaerobic treatment; the top water outlet (19) is connected with a water outlet peristaltic pump (21) through a pipeline to discharge the treated clarified water; the pressure sensor (20) is arranged on a middle pipeline of a top water outlet (19) of the shell (4) and the water outlet peristaltic pump (21), and is used for monitoring the change of the transmembrane pressure difference of the composite membrane assembly (5) so as to represent the membrane pollution condition.
2. The system for strengthening sludge methane conversion and membrane pollution resistance by combining carbon points with an electric membrane according to claim 1, wherein the carbon points fed by the carbon point feeding port (8) can be adsorbed on a composite membrane assembly (5) comprising a flat membrane and a membrane electrode to form a multi-layer membrane structure, so that a conductive layer is thickened.
3. The system for strengthening sludge methane conversion and membrane pollution resistance by combining carbon points with an electric membrane according to claim 1, wherein the carbon points added by the carbon point adding port (8) are prepared by citric acid pyrolysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322293630.XU CN220665136U (en) | 2023-08-25 | 2023-08-25 | System for strengthening methane conversion and membrane pollution resistance of sludge by combining carbon points with membrane |
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